National Assessment of Oil and Gas Fact Sheet 2002 USGS ...USGS Fact Sheet FS-002-03 February 2003...
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Denver Colorado Springs Cheyenne Scottsbluff WATTENBERG SILO SPINDLE FLORENCE WYOMING COLORADO SOUTH DAKOTA NEBRASKA KANSAS 107° 106° 105° 104° 103° 102° 44° 43° 42° 41° 40° 39° 38° 107° 106° 105° 104° 103° 102° 44° 43° 42° 41° 40° 39° 38° Miles 0 18 36 U.S. Department of the Interior U.S. Geological Survey USGS Fact Sheet FS-002-03 February 2003 Printed on recycled paper National Assessment of Oil and Gas Fact Sheet 2002 USGS Assessment of Oil and Gas Resource Potential of the Denver Basin Province of Colorado, Kansas, Nebraska, South Dakota, and Wyoming Introduction The U.S. Geological Survey (USGS) recently assessed undiscovered, technically recoverable oil and gas resources of the Denver Basin Province (fig. 1) that have the potential to be added to reserves in the next 30 years. Both conven- tional and continuous resources were assessed. Continuous-type accumulations include coal-bed gas (CBG), low-permeability gas, and fractured shales, which differ from conventional accumulations in that they are not signifi- cantly affected by hydrodynamics, there is no downdip gas/ water contact, and conventional methods of assessing sizes and numbers of accumulations are not appropriate (modified from Klett and others, 2000). Using analyses based on the study of total petroleum systems, the U.S. Geological Survey mean estimates of petroleum potential in the Denver Basin Province are 104.23 million barrels of oil, 2,519 billion cubic feet of gas, and 51.81 million barrels of natural gas liquids (NGL). More than 95 percent of that gas volume is in continuous (uncon- ventional) assessment units (AU). Using a total petroleum system method of analysis, the USGS defined seven total petroleum systems (TPS) and 12 assessment units (AU) in the province. TPS and AU are defined in Magoon and Dow (1994) and Klett and others (2000). Sources of information include published reports and the NRG Associates, Inc. (2000) and PI/Dwights (1999a, 1999b) databases. Resource Summary Estimates of the oil, gas, and natural gas liquids (NGL) potential for the Denver Basin Province are presented in table 1. Coal-bed gas resources (CBG) of the Denver Forma- tion Coal and Laramie Formation Coal AUs (50390181 and 50390182, respectively) of the Coal-Bed Methane TPS (503901) were not assessed due to scarcity of drill- ing information and other data. The Fractured Pierre Shale AU (50390361) was not assessed for continuous resources because of low undrilled potential based on analysis of estimated ultimate recovery of current wells. Mean estimates of the remaining five TPSs are 104.23 million barrels of oil (MMBO), 2,519 billion cubic feet of gas (BCFG), and 51.81 million barrels of NGL (MMBNGL) (table 1). More than 95 percent of the gas potential, or 2,408 BCFG, is in continuous AUs, the greatest gas resources being in the Dakota Group Basin-Centered Gas AU (1,094.70 BCFG) and the Niobrara Chalk AU (984.08 BCF biogenic gas). Approxi- mately 38 percent of the oil potential is within continuous AUs, although the greatest single AU oil resource (36.27 MMBO) is located within sandstones of the Dakota Group and D Sandstone conventional AU (table 1). The continuous Niobrara-Codell (Wattenberg area) AU has the second largest mean oil resource volume at 32.17 MMB. The following are generalized descriptions of the assessment units. Figure 1. The Denver Basin Province (red line) of Colorado, Kansas, Nebraska, South Dakota, and Wyoming. Shown are oil (green), gas (red), oil and gas (yellow) and nonproductive (black) wells
Transcript of National Assessment of Oil and Gas Fact Sheet 2002 USGS ...USGS Fact Sheet FS-002-03 February 2003...
Denver
Colorado Springs
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Scottsbluff
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FLORENCE
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SOUTH DAKOTA
NEBRASKA
KA
NSA
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107° 106° 105° 104° 103° 102°
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107° 106° 105° 104° 103° 102°44°
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Miles0 18 36
U.S. Department of the InteriorU.S. Geological Survey
USGS Fact Sheet FS-002-03February 2003
Printed on recycled paper
National Assessment of Oil and Gas Fact Sheet
2002 USGS Assessment of Oil and Gas Resource Potential of the Denver Basin Province of Colorado, Kansas, Nebraska, South Dakota, and WyomingIntroduction
The U.S. Geological Survey (USGS) recently assessed undiscovered, technically recoverable oil and gas resources of the Denver Basin Province (fi g. 1) that have the potential to be added to reserves in the next 30 years. Both conven-tional and continuous resources were assessed. Continuous-type accumulations include coal-bed gas (CBG), low-permeability gas, and fractured shales, which differ from conventional accumulations in that they are not signifi -cantly affected by hydrodynamics, there is no downdip gas/water contact, and conventional methods of assessing sizes and numbers of accumulations are not appropriate (modifi ed from Klett and others, 2000).
Using analyses based on the study of total petroleum systems, the U.S. Geological Survey mean estimates of petroleum potential in the Denver Basin Province are 104.23 million barrels of oil, 2,519 billion cubic feet of gas, and 51.81 million barrels of natural gas liquids (NGL). More than 95 percent of that gas volume is in continuous (uncon-ventional) assessment units (AU).
Using a total petroleum system method of analysis, the USGS defi ned seven total petroleum systems (TPS) and 12 assessment units (AU) in the province. TPS and AU are defi ned in Magoon and Dow (1994) and Klett and others (2000). Sources of information include published reports and the NRG Associates, Inc. (2000) and PI/Dwights (1999a, 1999b) databases.
Resource SummaryEstimates of the oil, gas, and natural gas liquids (NGL)
potential for the Denver Basin Province are presented in table 1. Coal-bed gas resources (CBG) of the Denver Forma-tion Coal and Laramie Formation Coal AUs (50390181 and 50390182, respectively) of the Coal-Bed Methane TPS (503901) were not assessed due to scarcity of drill-ing information and other data. The Fractured Pierre Shale AU (50390361) was not assessed for continuous resources because of low undrilled potential based on analysis of estimated ultimate recovery of current wells. Mean estimates of the remaining fi ve TPSs are 104.23 million barrels of oil (MMBO), 2,519 billion cubic feet of gas (BCFG), and 51.81 million barrels of NGL (MMBNGL) (table 1).
More than 95 percent of the gas potential, or 2,408 BCFG, is in continuous AUs, the greatest gas resources being in the Dakota Group Basin-Centered Gas AU (1,094.70 BCFG) and the Niobrara Chalk AU (984.08 BCF biogenic gas). Approxi-mately 38 percent of the oil potential is within continuous AUs, although the greatest single AU oil resource (36.27 MMBO) is located within sandstones of the Dakota Group and D Sandstone conventional AU (table 1). The continuous Niobrara-Codell (Wattenberg area) AU has the second largest mean oil resource volume at 32.17 MMB. The following are generalized descriptions of the assessment units.
Figure 1. The Denver Basin Province (red line) of Colorado, Kansas, Nebraska, South Dakota, and Wyoming. Shown are oil (green), gas (red), oil and gas (yellow) and nonproductive (black) wells
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Table 1. Denver Basin Province assessment results listed by name and code of total petroleum system and assessment unit.
[TPS, total petroleum system; AU, assessment unit; MMBO, million barrels or oil; BCFG, billion cubic feet of gas; MMBNGL, million barrels of natural gas liquids. Type refers mainly to oil or gas accumulations in the assessment unit. Fractiles are fully risked estimates. F95 denotes a 95-percent chance of at least the amount tabulated. Other fractiles are defined similarly. Fractiles are additive only under the assumption of perfect positive correlation. CBG, coal-bed gas. N/A, not quantitatively assessed or not applicable]
Total undiscovered resources Type Oil (MMBO) Gas (BCFG) NGL (MMBNGL)
F95 F50 F5 Mean F95 F50 F5 Mean F95 F50 F5 MeanConventional Oil and Gas Resources
Upper Cretaceous Fractured Niobrara TPS 503902 Fractured Niobrara Limestone
Transitional AU 50390201 Oil 0.00 0.00 2.08 0.58 0.00 0.00 0.21 0.06 Gas N/A N/A N/A N/A 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Lower Cretaceous TPS 503904 Dakota Group and D Sandstone AU
50390401 Oil 12.37 33.51 68.79 36.27 4.52 13.05 29.16 14.48 0.33 1.02 2.46 14.48
Gas N/A N/A N/A N/A 9.66 28.13 61.64 30.95 0.58 1.81 4.29 2.04Subthrust Structural AU 50390402 Oil 0.00 0.00 57.42 14.37 0.00 0.00 29.15 7.19 0.00 0.00 2.98 0.72
Gas N/A N/A N/A N/A 0.00 0.00 9.58 33.62 0.00 0.00 9.58 2.22Permian-Pennsylvanian TPS 503905
Permian-Pennsylvanian Reservoirs AU 50390501 Oil 2.11 9.43 23.70 10.74 1.03 4.65 12.55 5.45 0.06 0.27 0.79 0.33
Gas N/A N/A N/A N/A 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00Cretaceous Composite TPS 503906
Pierre Shale Sandstones AU 50390601 Oil 0.53 1.75 3.67 1.86 1.39 6.83 15.57 7.45 0.11 0.67 1.63 0.75Gas
N/A N/A N/A N/A 3.20 10.86 19.85 10.69 0.13 0.60 1.26 0.64
TOTAL CONVENTIONAL RESOURCES 15.02 44.69 157.57 64.40 19.81 62.73 312.66 110.41 1.21 4.36 23.20 7.91
Continuous Oil and Gas Resources Cretaceous Composite TPS 503906
Niobrara-Codell (Wattenburg area) AU 50390661 Oil 16.41 30.07 55.08 32.17 157.71 298.43 564.71 321.73 14.24 29.24 60.02 32.17
Dakota Group Basin-Centered Gas AU 50390662 Gas 0.00 0.00 0.00 0.00 793.09 1,076.03 1,459.92 1,094.70 6.71 10.54 16.55 10.95
Upper Cretaceous Niobrara Biogenic Gas TPS 503907 Niobrara Chalk AU 50390761 Gas 0.00 0.00 0.00 0.00 337.63 843.01 2,104.85 984.08 0.00 0.00 0.00 0.00
Upper Cretaceous Fractured Niobrara TPS 503902 Fractured Niobrara Limestone (Silo field
area) AU 50390261 Oil 4.32 7.29 12.27 7.66 4.09 7.34 13.17 7.82 0.37 0.72 1.41 0.78Upper Cretaceous Pierre Shale (Florence field) TPS 503903
Fractured Pierre Shale AU 50390361 Oil N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/ACoal-Bed Methane TPS 503901
Denver Formation Coals AU 50390181 CBG N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/ALaramie Formation Coals AU 50390182 CBG
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
TOTAL CONTINUOUS RESOURCES 20.74 37.35 67.35 39.83 1,292.52 2,224.81 4,142.64 2,408.33 21.33 40.50 77.98 43.90
TOTAL RESOURCES 35.75 82.04 224.92 104.23 1,312.33 2,287.53 4,455.30 2,518.74 22.54 44.86 101.19 51.81
Coal-Bed Methane TPS 503901 1. Denver Formation Coals AU 50390181—Hypothetical continuous coal-bed gas from the
Upper Cretaceous and Paleocene Denver Formation in the central Denver Basin Province. 2. Laramie Formation Coals AU 50390182—Hypothetical continuous coal-bed gas from the
Upper Cretaceous Laramie Formation in the central Denver Basin Province.
Upper Cretaceous Fractured Niobrara TPS 503902 1. Fractured Niobrara Limestone Transitional AU 50390201—Conventional; located in the
central Denver Basin Province and excludes areas of AUs 50390261 and 50390761. 2. Fractured Niobrara Limestone (Silo fi eld area) AU 50390261—Continuous; mostly oil
production from the Upper Cretaceous Niobrara Formation in the Silo fi eld area (fi g. 1).
Upper Cretaceous Pierre Shale (Florence Field) TPS 503903 1. Fractured Pierre Shale AU 50390361—Continuous; oil production from the Upper
Cretaceous Pierre Shale in the Florence fi eld area (fi g. 1).
Lower Cretaceous TPS 503904 1. Dakota Group and D Sandstone AU 50390401—Conventional; Cretaceous Muddy (J)
Sandstone reservoirs located across the central third of the province. 2. Subthrust Structural AU 50390402—This hypothetical conventional assessment unit of
Cretaceous and Paleozoic formations is located under and along the eastern edge of the Rocky Mountains.
Permian-Pennsylvanian TPS 503905 1. Permian-Pennsylvanian Reservoirs AU 50390501—Conventional; structural traps in
limestones and sandstones concentrated in the northwestern half of the province.
Cretaceous Composite TPS 503906 1. Pierre Shale Sandstones AU 50390601—Conventional reservoirs in the Upper Cretaceous
Richard, Terry (Sussex), and Hygiene (Shannon) Sandstones, Spindle fi eld area (fi g. 1). 2. Niobrara-Codell (Wattenberg area) AU 50390661—Continuous; oil and gas production
from Upper Cretaceous sandstone and limestone, Spindle fi eld area (fi g. 1). 3. Dakota Group Basin-Centered Gas AU 50390662—Continuous gas accumulation in the
Wattenberg gas fi eld (fi g. 1). Production is primarily from the Lower Cretaceous Muddy (J) Sandstone.
Upper Cretaceous Niobrara Biogenic Gas TPS 503907 1. Niobrara Chalk AU 50390761—Continuous; biogenic gas from the Niobrara Formation is
located in the eastern third of the province and extends eastward into Kansas and northward into South Dakota.
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Denver Basin Province Assessment TeamDebra Higley ([email protected], 303-236-5791), Ronald R. Charpentier, Troy Cook, T.R. Klett, Richard Pollastro, and James W.
Schmoker. Christopher J. Schenk, National Assessment of Oil and Gas Project Chief ([email protected], 303-236-5796).
For Further InformationSupporting geologic studies of total petroleum systems and assessment units for the Denver Basin Province are in progress. Assessment results
from the 1995 National Oil and Gas Assessment project are located at
http://energy.cr.usgs.gov/oilgas/noga/
References CitedKlett, T.R., Schmoker, J.W., Charpentier, R.R., Ahlbrandt, T.S., and Ulmishek, G.F., 2000, Glossary, in U.S. Geological Survey World Energy Assessment
Team, U.S. Geological Survey World Petroleum Assessment 2000—Description and results: U.S. Geological Survey DDS-60, 4 CD-ROMs. http://greenwood.cr.usgs.gov/energy/WorldEnergy/DDS-60/
Magoon, L.B., and Dow, W.G., 1994, The petroleum system, in L.B. Magoon, and Dow, W.G., eds., The petroleum system—From source to trap: American Association of Petroleum Geologists Memoir 60, p. 3–23.
NRG Associates, Inc., 2000, Signifi cant oil and gas fi elds database: Colorado Springs, Colorado, NRG Associates, Inc. [Database available from NRG Associates, Inc., P.O. Box 1655, Colorado Springs, CO 80901 U.S.A.]
PI/Dwights Well History Control System database, 1999a, [available from IHS Energy, 4100 Dry Creek Road, Littleton, CO 80122].
PI/Dwights petroROM Production Data on CD-ROM, 1999b, [available from IHS Energy, 4100 Dry Creek Road, Littleton, CO 80122].
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